One ogling heavenly bodies? (10)
I believe the answer is:
astronomer
'one ogling heavenly bodies?' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'one' is the wordplay.
I cannot really understand how this works, but
'one' could be 'er' (I've seen this in other clues) and 'er' is present in the answer.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for astronomer that I've seen before include "Space studier" , "Dorado may be contemplated by me" , "scientist" , "Stargazer" , "Star-watcher" .)